JP3438667B2 - ATM network system and ATM network method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM network system and an ATM network method, and more particularly to an ATM network system and an ATM network method for avoiding a failure in a short time.

[0002]

2. Description of the Related Art As a conventional technique relating to an ATM network system, for example, "Japanese Patent Laid-Open No. 11-11250" is used.
There is a technology described in "6."

According to this technique, each ATM switch exchanges the identification number of each ATM switch and the information of the IP address of each ATM terminal connected to each ATM switch with each other before storing them. Each ATM switch uses a control virtual channel for controlling IP routing based on the information.
It is established between switches, and then a communication virtual channel for each IP address is opened by a control virtual channel, and IP routing is performed on a cell basis by VPI / VCI instead of the IP address.

[0004]

The problem of the above-mentioned prior art is that it takes time to set another path for transferring data when a failure of the ATM switch occurs while transferring the data. Is large and inefficient.

The reason is that when the data transfer is completed, the control virtual channel VPI / VCI and the communication virtual channel VPI / VCI are immediately released. Therefore, the control virtual channel VPI / VCI,
This is because the communication virtual channel VPI / VCI must be set.

An object of the present invention is to control virtual channels VPI / VCI for a certain period of time even after data transfer is completed.
Is maintained, and data transfer via another route is efficiently performed when a failure occurs.

[0007]

A first ATM network system according to the present invention comprises a plurality of terminals and a plurality of ATM switches, and the ATM switches are connected to each other by connection ports corresponding to connection ports. Information is stored, and by the data communication from the data transfer source terminal, control virtual channels and communication virtual channels are set on a plurality of routes to the data transfer destination terminal, and the control virtual channel is set even after the data transfer is completed. maintaining the channel, set the communication virtual channel, when a failure occurs in the course of data transfer, using other control virtual channel is maintained, and sets the communication virtual channel, unobstructed path And has means for continuing data transfer.

A second ATM network system of the present invention is the above-mentioned first ATM network system, which comprises a transfer source IP address, a transfer destination IP address, an address of a communication virtual channel, an identification number of itself, and a control address. A means for transferring an IP routing control cell including a virtual holding time to the connected ATM switch, and, when receiving the IP routing control cell, sets a communication virtual address in accordance with the communication virtual address. It has the ATM switch.

A third ATM network system of the present invention is the second ATM network system according to the second ATM network system, wherein the control virtual channel is used even after the data transfer is completed according to the control virtual holding time in the IP routing control cell. To maintain the ATM switch.

A fourth ATM network system of the present invention is the first, second or third ATM network system, and based on the connection information, when a failure occurs in a certain route during data transfer. The ATM switch is configured to set a communication virtual channel using a control virtual channel with the ATM switch connected to another connection port and to continue data transfer through another route.

A first ATM network method of the present invention utilizes a plurality of terminals and a plurality of ATM switches,
A procedure for causing the ATM switch to store connection information corresponding to a connection port through communication between the ATM switches;
The ATM switch is caused to set a control virtual channel and a communication virtual channel on a plurality of routes to the data transfer destination terminal by data communication from the data transfer source terminal, and the control virtual channel is set even after the data transfer is completed. to maintain the channel, when the middle failure data transfer occurs, using other control virtual channel is maintained, is set the communication virtual channel to continue the data transfer without path disabilities Including steps and.

A second ATM network method of the present invention is the first ATM network method, wherein the transfer source IP address, transfer destination IP address, communication virtual channel address, and identification of itself are provided to the ATM switch. I, including the number and the virtual hold time for control
The AT to which the P routing control cell is connected
It includes a procedure of transferring to the M switch and a procedure of setting the communication virtual address according to the communication virtual address when the IP routing control cell is received.

A third ATM network method of the present invention is the second ATM network method, wherein after the data transfer is completed, the ATM switch is transferred to the ATM switch according to a control virtual holding time in an IP routing control cell. Also includes a procedure for maintaining a control virtual channel.

A fourth ATM network method of the present invention is the first, second or third ATM network method, wherein when a failure occurs in a certain route during data transfer, the ATM switch is It includes a procedure before the procedure of setting the communication virtual channel using the control virtual channel with the ATM switch connected to another connection port based on the connection information and continuing the data transfer through another route.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. Referring to FIG. 1, the first embodiment of the present invention is directed to a terminal 11
, Terminal 12, terminal 13, terminal 14, ATM switch 21, ATM switch 22, and ATM switch 2
3 and an ATM switch 24.

ATM switch 21 connection ports 1, 2,
3, 4 are respectively connected to the terminal 11, the terminal 13, the connection port 1 of the ATM switch 22 and the connection port 1 of the ATM switch 24, and the connection ports 1 and 2 of the ATM switch 22 are respectively connected to the ATM switch 21. Port 3, connected to the connection port 1 of ATM switch 23,
The connection ports 1, 2, 3, 4 of the TM switch 23 are connected to the connection port 2 of the ATM switch 22, the connection port 2 of the ATM switch 24, the terminal 12 and the terminal 14, respectively, and the connection port 1 of the ATM switch 24, 2 are connected to the connection port 4 of the ATM switch 21 and the connection port 2 of the ATM switch 23, respectively.

The connection port is a physical connection part of each ATM switch, and is generally a connector.

The IP address of the terminal 11 is IPa,
The IP address of the terminal 12 is IPb, the IP address of the terminal 13 is IPc, and the IP address of the terminal 14 is IPd. The identification number of the ATM switch 21 is "01", ATM
The identification number of the switch 22 is "02", and the ATM switch 2
The identification number of No. 3 is "03", and the identification number of the ATM switch 24 is "04".

FIG. 2 is an explanatory diagram showing connection information stored in each ATM switch of FIG. Referring to FIG.
The connection information finally stored in the ATM switch is such that the connection information of the directly connected terminal and other ATs is corresponding to each connection port.
The IP address of the terminal connected via the M switch,
And the identification number of the ATM switch directly connected.

For example, referring to FIG.
The connection information stored in the M switch 21 is the connection port 1
, IPa (IP address of directly connected terminal 11), connection port 2 to IPc (IP address of directly connected terminal 13), and connection port 3 to
IPb (IP address of the terminal 12 connected via the ATM switches 22 and 23), IPd (ATM switch 2
IPb (ATM) for the connection number 4 and the identification number “02” of the directly connected ATM switch 22).
IP of the terminal 12 connected via the switches 24 and 23
Address), IPd (IP address of the terminal 14 connected via the ATM switches 24 and 23), and the identification number "04" of the ATM switch 24 directly connected.

Further, referring to FIG. 2B, the connection information stored in the ATM switch 22 includes IPa (IP address of the terminal 11 connected via the ATM switch 21) for the connection port 1, IPc (ATM switch 2
IP address of the terminal 13 connected via 1), the identification number “01” of the ATM switch 21 directly connected, and IPb (ATM switch 23) to the connection connection port 2.
IP address of terminal 12 connected via IP), IPd
(I of the terminal 14 connected via the ATM switch 23
P address) and the identification number "03" of the ATM switch 23 directly connected.

Next, the operation of the first embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows the first of the present invention.
3 is a schematic flowchart showing the operation of the embodiment of FIG.
Referring to FIG. 3, first, before the operation of the ATM network is started, each ATM switch exchanges the identification number of each ATM switch and the information of the IP address connected thereto and stores it as connection information (step S31 in FIG. 3).

Next, when data transfer is started from the terminal, the control virtual channel VPI / VCI for controlling the communication path is set between all the ATM switches based on the connection information (step S32 in FIG. 3).

Next, by the control virtual channel,
The IP routing control cell is transferred , and the communication virtual channel VPI / VCI is set between the ATM switches (step S33 in FIG. 3).

Next, the virtual channel for communication VPI /
Data transfer is carried out by VCI (step S3 in FIG. 3).
4).

When a failure occurs in the communication virtual channel (ATM switch) during data communication (step S35 / YES in FIG. 3), the ATM switch switches the communication path and sets the communication virtual channel of another ATM switch. Communication is continued (step S36 in FIG. 3).

Since the control virtual channel is still held, the communication virtual channel is set up in a short time.

FIG. 4 is an explanatory diagram showing the structure of the IP routing control cell. Referring to FIG. 4, the IP routing control cell includes a transfer source IP address IPa, a transfer destination IP address IPb, and a communication virtual channel VP.
I / VCI address, own ATM switch identification number,
It also includes the holding time of the control virtual channel VPI / VCI.

Next, the operation of the embodiment of the present invention will be described in more detail with reference to the drawings. 5, 6, and 7 are detailed flowcharts showing the operation of the first exemplary embodiment of the present invention. First, the operation before the start of data transfer will be described. Before the data transfer, the identification number is set in the ATM switch by using the MAC address as the identifier of the ATM switch. For example, each ATM switch is activated by software when the power is turned on.
A specific number of bits of the MAC address written in the OM or the like are acquired and set as an identification number in the main memory or the like included in the ATM switch (step S51 in FIG. 5).

This is done so that there is no overlap. For example, in FIG. 1, the identification numbers are “01”, “02”,
This is the case of "03" and "04".

Next, each ATM switch exchanges ATM switch identification numbers between directly connected ATM switches, and associates the connection port of each ATM switch with the identification number of the ATM switch connected to the connection port. And stores it as connection information (step S52 in FIG. 5).

The ATM switch 21 is the ATM switch 2
2. From the ATM switch 24, the identification number "0"
2 ”and“ 04 ”are acquired, and connection ports 3 and 4 are acquired, respectively.
Correspond to. The ATM switch 22 receives the identification number "0" from the ATM switch 21 and the ATM switch 23, respectively.
1 ”and“ 03 ”are acquired, and connection ports 1 and 2 are respectively acquired.
Correspond to. The ATM switch 23 receives the identification number "0" from the ATM switch 22 and the ATM switch 24, respectively.
2 ”and“ 04 ”are acquired, and connection ports 1 and 2 are acquired, respectively.
Correspond to. The ATM switch 24 receives the identification number "0" from the ATM switch 21 and the ATM switch 23, respectively.
1 ”and“ 03 ”are acquired, and connection ports 1 and 2 are respectively acquired.
Correspond to.

Next, each ATM switch acquires the IP address from the directly connected terminal, and the connection port of each ATM switch and the I of the terminal connected to the connection port.
It is associated with the P address and stored as connection information (step S53 in FIG. 5).

The ATM switch 21 includes terminals 11 and 1.
Obtain IP addresses IPa and IPc respectively from 3,
Corresponding to the connection ports 1 and 2, respectively. The ATM switch 23 acquires the IP addresses IPb and IPd from the terminal 12 and the terminal 14, respectively, and associates them with the connection ports 3 and 4, respectively.

Next, each ATM switch exchanges the IP address of the connected terminal, and the IP of the terminal connected via the connection port of each ATM switch and the ATM switch connected to the connection port. The address is associated and stored as connection information (step S5 in FIG. 5).
4).

The ATM switch 22 is the ATM switch 2
1 to the IP addresses IPa, I of the terminals 11 and 13
Pc is acquired and associated with the connection port 1, and from the ATM switch 23, the IP address IPb of the terminal 12 and the terminal 14,
IPd is acquired and associated with connection port 2. The ATM switch 24 acquires the IP addresses IPa and IPc of the terminals 11 and 13 from the ATM switch 21 and associates them with the connection port 1, and acquires the IP addresses IPb and IPd of the terminals 12 and 14 from the ATM switch 23. Corresponds to connection port 2.

Next, the ATM switch 21 receives the IP addresses IP of the terminals 12 and 14 from the ATM switch 22.
b, IPd are acquired and associated with the connection port 3, and the IP addresses I of the terminals 12 and 14 are input from the ATM switch 24.
Pb and IPd are acquired and associated with the connection port 4. AT
The M switch 23 is connected to the terminal 1 from the ATM switch 22.
1. The IP addresses IPa and IPc of the terminal 13 are acquired and associated with the connection port 1, and the IP addresses IPa and IPc of the terminals 11 and 13 are acquired from the ATM switch 24 and associated with the connection port 2.

As described above, the ATM switch 21,
The connection information of the ATM switch 22 is shown in FIG.
It is stored as shown in (a) and (b).

Next, the case where data transfer from the terminal 11 to the terminal 12 is carried out using the IP address will be described.

The terminal 11 is the terminal 1 which is the data transfer source.
1 IP address IPa, IP of the transfer destination terminal 12
The transfer data cell including the address IPb and the data is transferred to the ATM switch 21 (step S6 in FIG. 6).
1).

Upon receiving the transfer data cell, the ATM switch 21 temporarily holds the cell and sets a control virtual channel and a communication virtual channel VPI / VCI with the terminal 11. For example, the address 00000 of the control virtual channel VPI / VCI and the address 000 of the communication virtual channel VPI / VCI.
1 is set (step S62 in FIG. 6).

Next, the ATM switch 21 communicates with the ATM switch 22 based on the stored connection information,
An address 0010 of a control virtual channel, for example, a control virtual channel VPI / VCI is set between the ATM switch 22 and the terminal 11. Then, based on the transfer data cell received from the terminal 11, “transfer source IP address IPa, transfer destination IP address IPb, communication virtual channel VPI / VCI address 0011, own identification number“ 01 ”, control virtual IP including channel VPI / VCI hold time
A routing control cell is created and the ATM switch 22 is operated by the control virtual channel VPI / VCI.
(Step S63 in FIG. 6).

Further, the ATM switch 21 communicates with the ATM switch 24 on the basis of the stored connection information, and the control virtual channel, for example, the control virtual channel VPI / is communicated with the ATM switch 24.
Set the VCI address 0020. And terminal 1
Based on the cell for transfer data received from 1, “transfer source IP address IPa, transfer destination IP address IPb, communication virtual channel VPI / VCI address 002
1. An IP routing control cell including its own identification number “01” and control virtual channel VPI / VCI holding time ”is created and transferred to the ATM switch 24 by the control virtual channel VPI / VCI (FIG. 6 step S64).

Next, when the ATM switch 22 receives the IP routing control cell from the ATM switch 21, the ATM virtual communication channel VPI / VCI is sent to the ATM switch 22.
It is set between the switch 21 and the communication virtual channel VPI / VCI address 0011, and the ATM
Communicates with switch 23 to control virtual channel VP
Set the I / VCI. For example, the address 0030 of the control virtual channel VPI / VCI is set (step S65 in FIG. 6).

Further, when the ATM switch 24 receives the IP routing control cell from the ATM switch 21, the ATM switch 24 sends the communication virtual channel VPI / VCI to the ATM.
It is set between the switch 21 and the communication virtual channel VPI / VCI address 0021, and the ATM
Communicates with switch 23 to control virtual channel VP
Set the I / VCI. For example, the address 0040 of the control virtual channel VPI / VCI is set (step S66 in FIG. 6).

Next, the ATM switch 22 determines "transfer source IP address IPa, transfer destination IP address IPb, communication virtual channel VPI / VCI" based on the IP routing control cell received from the ATM switch 21.
Address 0031, own identification number “02”, and control virtual channel VPI / VCI holding time ”, and an IP routing control cell is created and transferred to the ATM switch 23 by the control virtual channel VPI / VCI. (FIG. 6 step S67).

Further, the ATM switch 24, based on the IP routing control cell received from the ATM switch 21, "transfer source IP address IPa, transfer destination IP address IPb, communication virtual channel VPI / VCI.
Address 0041, its own identification number “04”, and control virtual channel VPI / VCI holding time ”are created and transferred to the ATM switch 23 by the control virtual channel VPI / VCI. (FIG. 6 step S68).

The ATM switch 23 is the ATM switch 2
When the IP routing control cell is received from 2 , the communication virtual channel VPI / VCI is set between the ATM switch 22 and the communication virtual channel VPI / VCI (communication virtual channel VP
The control virtual channel VPI / VCI and the communication virtual channel VPI / VCI are set between the I / VCI address 0031) and the terminal 12. For example, the address 00 of the control virtual channel VPI / VCI
50, the address 0051 of the communication virtual channel VPI / VCI is set (step S69 in FIG. 6).

Further, when the ATM switch 23 receives the IP routing control cell from the ATM switch 24, the ATM virtual communication channel VPI / VCI is transmitted to the ATM switch 23.
It is set to the switch 24 (address 0041 of communication virtual channel VPI / VCI) (step S69 in FIG. 6).

Next, the ATM switch 21 transfers the held transfer data cell to the ATM switch 22 via the set communication virtual channel (0011) (in this case, an ATM switch having a large identification number is used). Is not transferred) (step S70 in FIG. 6).

The ATM switch 22 is the ATM switch 2
When the cell for transfer data is received from No. 1, it is transferred to the ATM switch 23 via the set communication virtual channel (0031) (step S71 in FIG. 6).

The ATM switch 23 is the ATM switch 2
When the transfer data cell is received from No. 2, it is transferred to the terminal 12 through the set communication virtual channel (0051) (step S72 in FIG. 6).

As described above, the virtual address for control from the ATM switch 21 to the ATM switch 23 thus opened allows the IP address IPa to the IP address IP.
Virtual channel V for communication for data communication to b
Since the PI / VCI is set, the transfer data cell to the IP address IPb can be transferred to the terminal 12.

Upon completion of data transfer, each ATM switch releases the communication virtual channel VPI / VCI, and according to the "holding time of the control virtual channel VPI / VCI" included in the IP routing control cell, The control virtual channel VPI / VCI is maintained (step S73 in FIG. 6).

Next, a case where a failure occurs during transfer of the transfer data cell will be described with reference to the drawings. ATM
If the switch 22 fails, the ATM switch 2
1 continues data transfer using ATM switch 24. That is, within the holding time of the maintained control virtual channel VPI / VCI, based on the transfer data cell received from the terminal 11, "transfer source IP address IPa, transfer destination IP address IPb, communication virtual Channel VPI / VCI address 0021, own identification number “01”, control virtual channel VP
An IP routing control cell including "I / VCI hold time" is created, and this is set as a control virtual channel VPI.
/ VCI to the ATM switch 24 (step S81 in FIG. 7).

The ATM switch 24 is the ATM switch 2
When the IP routing control cell is received from 1, the communication virtual channel VPI / VCI is set to the ATM switch 21 (communication virtual channel VP
I / VCI address 0011) (step S8 in FIG. 7)
2).

Next, the ATM switch 24 uses the control "transfer source IP address IPa, transfer destination I" based on the IP routing control cell received from the ATM switch 21.
P address IPb, communication virtual channel VPI /
VCI address 0041, own identification number “04”,
Control virtual channel VPI / VCI retention time ”
A cell for IP routing control including is created and is transferred to the ATM switch 23 by the control virtual channel VPI / VCI (step S83 in FIG. 7).

The ATM switch 23 is the ATM switch 2
4 receives the IP routing control cell, the communication virtual channel VPI / VCI is set to the ATM switch 24 (communication virtual channel VP
Between the I / VCI address 0041) and the terminal 12,
The communication virtual channel VPI / VCI is set.
For example, the address 0051 of the communication virtual channel VPI / VCI is set (step S84 in FIG. 7).

Next, the ATM switch 21 transfers the held transfer data cell to the ATM switch 24 via the communication virtual channel (0021).

The ATM switch 24 is the ATM switch 2
When the cell for transfer data is received from No. 1, it is transferred to the ATM switch 23 via the set communication virtual channel VPI / VCI (0041) (step S8 in FIG. 7).
5).

The ATM switch 23 is the ATM switch 2
When the cell for transfer data is received from No. 2, it is transferred to the terminal 12 via the set communication virtual channel VPI / VCI (0061) (step S86 in FIG. 7).

As described above, data communication can be continued through another route. Further, if it is within the virtual channel holding time of the IP routing control cell,
Since the control virtual channel VPI / VCI is held, the communication virtual channel VPI can be obtained in a short time.
/ VCI can be done.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings. The second embodiment of the present invention is an ATM network method including each function of the first embodiment of the present invention as a procedure. Specifically, it is an ATM network method including the steps of FIGS. 5, 6, and 7.

[0064]

The effect of the present invention is that when data communication becomes impossible in an ATM network due to a failure of an ATM switch or the like, another path is set in a short time and data transfer can be continued.

The reason is that the control virtual channel is maintained for a certain time even after the data transfer is completed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the contents of connection information.

FIG. 3 is a schematic flowchart showing the operation of the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of an IP routing control cell.

FIG. 5 is a detailed flowchart showing the operation of the embodiment of the present invention.

FIG. 6 is a detailed flowchart showing the operation of the embodiment of the present invention.

FIG. 7 is a detailed flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

11 terminals 12 terminals 13 terminals 14 terminals 21 ATM switch 22 ATM switch 23 ATM switch 24 ATM switch

Claims (8)

(57) [Claims] 1. A plurality of terminals and a plurality of ATM switches, wherein the ATM switches store connection information corresponding to connection ports by mutual communication of the ATM switches, and data communication from the terminal of a data transfer source. Accordingly, setting the control virtual channel and a communication virtual channel to a plurality of paths to the terminal of the data transfer destination, after completion of the data transfer also to maintain the control virtual channel, during the de <br/> over data transfer If a failure occurs in the other
An ATM network system having means for setting a communication virtual channel by using the control virtual channel of 1. and continuing data transfer through a path without a failure. 2. The ATM switch to which an IP routing control cell including a transfer source IP address, a transfer destination IP address, a communication virtual channel address, its own identification number, and a control virtual holding time is connected. 3. The ATM switch according to claim 1, further comprising: a means for transferring to an IP routing control cell, and the ATM switch for setting a communication virtual address in accordance with a communication virtual address when receiving the IP routing control cell.
Network system. 3. The ATM network according to claim 2, further comprising the ATM switch that maintains the control virtual channel even after the data transfer ends according to the control virtual holding time in the IP routing control cell. system. 4. A virtual channel for communication using a virtual channel for control with the ATM switch connected to another connection port based on the connection information when a failure occurs in a certain path during data transfer. Set
4. The A according to claim 1, further comprising the ATM switch for continuing the data transfer through another route.
TM network system. 5. A procedure of using a plurality of terminals and a plurality of ATM switches to store connection information corresponding to a connection port in the ATM switch through mutual communication of the ATM switches, and data transfer to the ATM switch. the data communication from the source of the terminal, to set a plurality of control virtual channel and a communication virtual channel path to the terminal of the data transfer destination, after completion of the data transfer also to maintain the control virtual channel, de chromatography If a failure occurs in the middle of data transfer, the other control virtual channel maintained is used to set a communication virtual channel, and the data transfer is continued on a path without failure. Network method. 6. An IP routing control cell including a transfer source IP address, a transfer destination IP address, a communication virtual channel address, an identification number of itself, and a control virtual holding time is connected to the ATM switch. The transfer to the ATM switch,
6. The ATM network method according to claim 5, further comprising a step of setting a communication virtual address in accordance with a communication virtual address when the P routing control cell is received. 7. The method according to claim 6, further comprising a step of causing the ATM switch to maintain the control virtual channel after the data transfer is completed according to the control virtual holding time in the IP routing control cell. ATM network method. 8. When a failure occurs in a certain path during data transfer, the ATM switch uses a control virtual channel with the ATM switch connected to another connection port based on the connection information. 8. The ATM network method according to claim 5, 6 or 7, further comprising a step before a procedure of setting a communication virtual channel and continuing data transfer through another path.